Centrifugal pulverizing-mill.



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A. RAYMOND, DECD.

M. M. BABTBLMB, ADMINISTBATRIX.

CENTRIPUGAL PULVERIZING MILL. A

APPLICATION FILED LIAY 19. 1902.

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No. 775,069. PATENTED NOV. 15, 1904.

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No. 775,069. PATENTED NOV. l5, 1904.

A. RAYMOND, DECD.

M. M. BARTBLMB, ADMINISTBATRIX. ENTRIFUGAL PULVERIZING MILL.

APPLICATION FILED MAY 19. 1902.

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UNITED STATES ATENT Fricij.,

ALBERT RAYMOND. OF CHICAGO, ILLINOIS; MARY M. BAR'IICLMIC ADMIN- IS'IRATRIX OF SAID RAYMOND. DIXEASID.

CENTRIFUGAL PULVERIZING-NIILL..

SPECIFICATION forming' part of Letters Patent No. 775,069, dated November 15, 1904.

Application filed May 19,1902. Serial No. 108,040. lNo inodeld Be it known that I, ALBERT RAYMOND, a citi- Zen of the United States, residing at Chicago, in f the county of Oook and State of Illinois, have invented certain new and useful Improvements in Centrifugal Pulverizing-Mills, of which the ,1

following is a specification.

The object of my invention is to provide a pulverizing-mill of the centrifugal roller type in which the usual inner cone used to facilitate the separation of the pulverized material from the coarser material, as shown in my Patent No. 612,717. may be dispensed with, thereby permitting of the construction ot` mills of greatly-reduced height-ma point of considerable importance in many situations.

Another object of my invention is to proor outer surface of the crushing-rolls where i sectional rolls are used, while at the same time attaching the roll to or removing it Vfrom the r particles deposited upon the upper surface of roll-shaft.

These and such other objects as may hereinafter appear are attained by the devices illustrated in the accompanying' drawings, in which* Figure l is a vertical section through my improved mill. Fig. 2 is a view, partly in section, through myjournal-box. Fig. 3 isa vertical section showing an enlarged detail through a part of the crushing-roll and lower end of the roll-shaft. Fig. -I is a transverse section on the line -L 4: of Fig. 3. Fig. is a detail showing the two keys. is an elevation of a complete pulvei'izing and separating plant embodying my invention, and Fig. T is a plan view of the same.

Like letters of reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying' drawings, A is the outer casing, within which rotates the main shaft B, which carries the spider O, upon the arms ot' which are mounted the journal-boxes D, within which in turn are supported the roll-shaftsE, carrying the crushing-rolls F. An induced current enters the casing A through the casing (1", whence it passes upward between the rolls and out at the exhaust I-l. VInstead of providingl the casing A with the usual inner cone` around and over which the dust-laden aii passes, l provide a disk I, which is supported upon and attached to the spider O by meansl of suitable supports J. The disk I is less in diameter than that part of the easing A within which the disk is mounted, thereby proif'idingl an annular air-passage L around the disk l. The induced dust-laden current of air passing upwardly within the casingA and past the edge of the disk I is guided downwardly in the dii'ection of the disk l by the cone M. lt then passes upwardly toward the exhaust H and escapes. The heavier uncrushed particles of mattei' which have been carried upwardly by the air-current Vfall upon the upper surface of the disk I, while the dust or powder remains in suspension and is carried away through the eXhaustH bythe air-eu rrent. 'l`hediskl being mounted upon and attached to the spider (l rotates therewith, with the result that the the disk I are thrown otl' of the saine by centrifugal force and drop back to the crushingrolls.

In order to readily attach the erushing-roll to the lower end of the roll-shaft` I provide the crushing-roll with a centrally-arranged opening shaped like the frustnni of a cone, a portion of the roll-shaftadjacenttoits lower end beingcorrespondingly tapered tolit within said conical opening. Upon the under surface of the crushing-rolll provide a recess or seat having outwardly-tapered walls.

Having fitted the roll-shaft E into the coned opening through the roll F,l lit over the lower end of the shaft IC and below the roll F a block N, which is provided with an enlarged disk-like upper portion n, having a tapered periphery and arranged to partially tit within the seat formed in the under surface of the roll F, so that while the periphery of the upper portion of thc block N is brought into close contact with the coned inner wall of the seat provided therefor the upper surface of the block N and the under surface of the roll F will not be brought into contact with each other. The lower end of the shaft E is provided with an elongated slot O, which slot extends upwardly within the disk-like portion of the block N.

In order to obtain a key for locking the shaft to the roll which shall have sufficient strength to withstand the strain put upon a key in this position and at the same time to provide ashoulder against whicha locked nut upon the end of the key may abut, all without increasing the length of the shaft, I providean auxiliary key P, which has an upwardly-extending shoulder p. This key is fitted within the slot O, so that the shoulder p extends into the upper portion of the slot O and abutsagainst the wall of the perforation through the block N. The auxiliary key P is held in this position by inserting the tapered key Q through the slot O and below the key P. The key Q being now driven home will be tightly wedged against the bottom of the auxiliary key P, so that the two keys constitute virtually-one compound key P Q, which sustains the strain of locking the shaft E, the roll F, and the block N together. At the same time the keyP affords a shoulder above the key Q and the block N atiords a shoulder below the key Q, against which shoulders the locked nut S' abuts.

There a sectional roll is used,the outer section of the roll consists of a separable ring R, having a centrally-arranged opening therethrough with oppositely tapered walls, as

` shown in Fig. 3, within which the roll F is inserted from one side and the block N from the other side, the outer peripheries of the roll F and the block N being tapered to correspond with the oppositely-disposed tapering portions of the wall of the central opening through the ring R. The result is that when the roll F and the block N are wedged toward each other by tightening the key Q they are tightly wedged within the ring R, Awhich is thereby rigidly secured to the periphery of the crushing-roll F.

In Fig. 6, R is the fan; S, the separatonfrom which the separated dust escapes at T and the air-current returns through the return airpipe U to the casing G.

Having thus described my invention, what l claim, and desire to secure by Letters Patent, is-

l. In a machine of the class described, the

combination with the roll-shaft, a crushingroll core wedged thereon, a locking-block and a key, of an auxiliary key seated within an opening through the lower end of said shaft and above and in contact with the key, said auxiliary key being provided with shoulders which abut against the walls of a central opening through the locking-block, substantially as described.

2. The combination with the casing having its upper portion formed with an opening, an approximately conical ring encircling the said opening, and the main shaft, journaled in the said casing, of the spider mounted to rotate with the said shaft, and a disk secured to the said spider, the said disk being arranged below the said conical ring, substantially as described.

3'. The combination with the roll-shaft having its end formed with an elongated slot, of a crushing-roll comprising' an inner section or member mounted on the roll-shaft, a ring encircling said inner section or member and having the lower portion of its interior tapered, a block having a disk-shaped upper end, said disk-shaped upper end having its periphery tapered and received in the lower portion of the said ring, and said block having apertures registering with the slot in the shaft, a key projecting through said apertures and having its central portion enlarged and engaging the slot of the shaft, and an auxiliary key engaging the first-named key, substantially as described.

4. The com bination with the casing formed in its upper end with an opening and a deflector arranged adjacent to the said opening, of grinding mechanism, and a disk of greater proportions than the saidv defiector carried by the said grinding means and being arranged directly below the said deliector.

5. The combination with the roll-shaft, cfa crushing-roll comprising an inner section or member having its periphery tapered and a ring encircling the said member, of a diskshaped block arranged in said ring, said block being formed with an apertured extended portion, and a key extending from the aperture of the said extended portion of the block and through an aperture in the said shaft.

ALBERT RAYMOND.

Witnesses:

O. R. BARNETT, M. E. SHIELDs.

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